Added LocalTime.Formats.ISO_BASIC (ISO 8601 basic format)

core/api/kotlinx-datetime.api

@@ -449,6 +449,7 @@ public final class kotlinx/datetime/LocalDateTime$Companion {
 public final class kotlinx/datetime/LocalDateTime$Formats {
 	public static final field INSTANCE Lkotlinx/datetime/LocalDateTime$Formats;
 	public final fun getISO ()Lkotlinx/datetime/format/DateTimeFormat;
+	public final fun getISO_BASIC ()Lkotlinx/datetime/format/DateTimeFormat;
 }
 
 public final class kotlinx/datetime/LocalDateTimeKt {
@@ -494,6 +495,7 @@ public final class kotlinx/datetime/LocalTime$Companion {
 public final class kotlinx/datetime/LocalTime$Formats {
 	public static final field INSTANCE Lkotlinx/datetime/LocalTime$Formats;
 	public final fun getISO ()Lkotlinx/datetime/format/DateTimeFormat;
+	public final fun getISO_BASIC ()Lkotlinx/datetime/format/DateTimeFormat;
 }
 
 public final class kotlinx/datetime/LocalTimeKt {

core/api/kotlinx-datetime.klib.api

@@ -444,6 +444,8 @@ final class kotlinx.datetime/LocalDateTime : kotlin/Comparable<kotlinx.datetime/
     final object Formats { // kotlinx.datetime/LocalDateTime.Formats|null[0]
         final val ISO // kotlinx.datetime/LocalDateTime.Formats.ISO|{}ISO[0]
             final fun <get-ISO>(): kotlinx.datetime.format/DateTimeFormat<kotlinx.datetime/LocalDateTime> // kotlinx.datetime/LocalDateTime.Formats.ISO.<get-ISO>|<get-ISO>(){}[0]
+        final val ISO_BASIC // kotlinx.datetime/LocalDateTime.Formats.ISO_BASIC|{}ISO_BASIC[0]
+            final fun <get-ISO_BASIC>(): kotlinx.datetime.format/DateTimeFormat<kotlinx.datetime/LocalDateTime> // kotlinx.datetime/LocalDateTime.Formats.ISO_BASIC.<get-ISO_BASIC>|<get-ISO_BASIC>(){}[0]
     }
 }
 
@@ -480,6 +482,8 @@ final class kotlinx.datetime/LocalTime : kotlin/Comparable<kotlinx.datetime/Loca
     final object Formats { // kotlinx.datetime/LocalTime.Formats|null[0]
         final val ISO // kotlinx.datetime/LocalTime.Formats.ISO|{}ISO[0]
             final fun <get-ISO>(): kotlinx.datetime.format/DateTimeFormat<kotlinx.datetime/LocalTime> // kotlinx.datetime/LocalTime.Formats.ISO.<get-ISO>|<get-ISO>(){}[0]
+        final val ISO_BASIC // kotlinx.datetime/LocalTime.Formats.ISO_BASIC|{}ISO_BASIC[0]
+            final fun <get-ISO_BASIC>(): kotlinx.datetime.format/DateTimeFormat<kotlinx.datetime/LocalTime> // kotlinx.datetime/LocalTime.Formats.ISO_BASIC.<get-ISO_BASIC>|<get-ISO_BASIC>(){}[0]
     }
 }
 

core/common/src/LocalDateTime.kt

@@ -194,6 +194,25 @@ public expect class LocalDateTime : Comparable<LocalDateTime> {
          * @sample kotlinx.datetime.test.samples.LocalDateTimeSamples.Formats.iso
          */
         public val ISO: DateTimeFormat<LocalDateTime>
+
+        /**
+         * ISO 8601 basic format.
+         *
+         * Examples of datetime in ISO 8601 format:
+         * - `20200830T1843`
+         * - `+120200830T184300`
+         * - `00000830T184300.5`
+         * - `-00010830T184300.123456789`
+         *
+         * When formatting, seconds are included, only if they are non-zero.
+         * Fractional parts of the second are included if non-zero.
+         *
+         * See ISO-8601-1:2019, 5.4.2.1b), the version without the offset, together with
+         * [LocalDate.Formats.ISO_BASIC] and [LocalTime.Formats.ISO_BASIC].
+         *
+         * @sample kotlinx.datetime.test.samples.LocalDateTimeSamples.Formats.basicIso
+         */
+        public val ISO_BASIC: DateTimeFormat<LocalDateTime>
     }
 
     /**

core/common/src/LocalTime.kt

@@ -197,6 +197,18 @@ public expect class LocalTime : Comparable<LocalTime> {
      * [kotlinx.datetime.format.DateTimeFormat] for [LocalTime] values.
      */
     public object Formats {
+        /**
+         * ISO 8601 basic format.
+         *
+         * Examples: `T1234`, `T123456`, `T123456.789`, `T123456.1234`.
+         *
+         * When formatting, seconds are always included, even if they are zero.
+         * Fractional parts of the second are included if non-zero.
+         *
+         * @sample kotlinx.datetime.test.samples.LocalTimeSamples.Formats.isoBasic
+         */
+        public val ISO_BASIC: DateTimeFormat<LocalTime>
+
         /**
          * ISO 8601 extended format.
          *

core/common/src/format/LocalDateTimeFormat.kt

@@ -82,4 +82,11 @@ internal val ISO_DATETIME by lazy {
     }
 }
 
+internal val ISO_DATETIME_BASIC by lazy {
+    LocalDateTimeFormat.build {
+        date(ISO_DATE_BASIC)
+        time(ISO_TIME_BASIC)
+    }
+}
+
 private val emptyIncompleteLocalDateTime = IncompleteLocalDateTime()

core/common/src/format/LocalTimeFormat.kt

@@ -279,6 +279,25 @@ internal class LocalTimeFormat(override val actualFormat: CachedFormatStructure<
 }
 
 // these are constants so that the formats are not recreated every time they are used
+internal val ISO_TIME_BASIC by lazy {
+    LocalTimeFormat.build {
+        alternativeParsing({ char('t') }) { char('T') }
+        hour()
+        minute()
+        alternativeParsing({
+            // intentionally empty
+        }) {
+            optional {
+                second()
+            }
+            optional {
+                char('.')
+                secondFraction(1, 9)
+            }
+        }
+    }
+}
+
 internal val ISO_TIME by lazy {
     LocalTimeFormat.build {
         hour()

core/common/test/format/LocalDateTimeFormatTest.kt

@@ -224,6 +224,41 @@ class LocalDateTimeFormatTest {
         test(dateTimes, LocalDateTime.Formats.ISO)
     }
 
+    @Test
+    fun testBasicIso() {
+        val dateTimes = buildMap<LocalDateTime, Pair<String, Set<String>>> {
+            put(LocalDateTime(2008, 7, 5, 0, 0, 0, 0), ("20080705T0000" to setOf("20080705T0000")))
+            put(LocalDateTime(2007, 12, 31, 1, 0, 0, 0), ("20071231T0100" to setOf("20071231t010000")))
+            put(LocalDateTime(999, 11, 30, 23, 0, 0, 0), ("09991130T2300" to setOf()))
+            put(LocalDateTime(-1, 1, 2, 0, 1, 0, 0), ("-00010102T0001" to setOf()))
+            put(LocalDateTime(9999, 10, 31, 12, 30, 0, 0), ("99991031T1230" to setOf()))
+            put(LocalDateTime(-9999, 9, 30, 23, 59, 0, 0), ("-99990930T2359" to setOf()))
+            put(LocalDateTime(10000, 8, 1, 0, 0, 1, 0), ("+100000801T000001" to setOf()))
+            put(LocalDateTime(-10000, 7, 1, 0, 0, 59, 0), ("-100000701T000059" to setOf()))
+            put(LocalDateTime(123456, 6, 1, 13, 44, 0, 0), ("+1234560601T1344" to setOf()))
+            put(LocalDateTime(-123456, 5, 1, 13, 44, 0, 0), ("-1234560501T1344" to setOf()))
+            put(LocalDateTime(123456, 6, 1, 0, 0, 0, 100000000), ("+1234560601T0000.1" to setOf("+1234560601T000000.1", "+1234560601T000000.10", "+1234560601T000000.100")))
+            put(LocalDateTime(-123456, 5, 1, 0, 0, 0, 10000000), ("-1234560501T0000.01" to setOf("-1234560501T000000.01")))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 1000000), ("20220102T0000.001" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 100000), ("20220102T0000.0001" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 10000), ("20220102T0000.00001" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 1000), ("20220102T0000.000001" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 100), ("20220102T0000.0000001" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 10), ("20220102T0000.00000001" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 1), ("20220102T0000.000000001" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 999999999), ("20220102T0000.999999999" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 99999999), ("20220102T0000.099999999" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 9999999), ("20220102T0000.009999999" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 999999), ("20220102T0000.000999999" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 99999), ("20220102T0000.000099999" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 9999), ("20220102T0000.000009999" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 999), ("20220102T0000.000000999" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 99), ("20220102T0000.000000099" to setOf()))
+            put(LocalDateTime(2022, 1, 2, 0, 0, 0, 9), ("20220102T0000.000000009" to setOf()))
+        }
+        test(dateTimes, LocalDateTime.Formats.ISO_BASIC)
+    }
+
     @Test
     fun testDoc() {
         val dateTime = LocalDateTime(2020, 8, 30, 18, 43, 13, 0)

core/common/test/samples/LocalTimeSamples.kt

@@ -280,6 +280,20 @@ class LocalTimeSamples {
     }
 
     class Formats {
+        @Test
+        fun isoBasic() {
+            // Parsing and formatting LocalTime values using the ISO_BASIC format
+            val timeWithNanoseconds = LocalTime(hour = 8, minute = 30, second = 15, nanosecond = 160_000_000)
+            val timeWithSeconds = LocalTime(hour = 8, minute = 30, second = 15)
+            val timeWithoutSeconds = LocalTime(hour = 8, minute = 30)
+            check(LocalTime.Formats.ISO_BASIC.parse("T083015.16") == timeWithNanoseconds)
+            check(LocalTime.Formats.ISO_BASIC.parse("T083015") == timeWithSeconds)
+            check(LocalTime.Formats.ISO_BASIC.parse("T0830") == timeWithoutSeconds)
+            check(LocalTime.Formats.ISO_BASIC.format(timeWithNanoseconds) == "T083015.16")
+            check(LocalTime.Formats.ISO_BASIC.format(timeWithSeconds) == "T083015")
+            check(LocalTime.Formats.ISO_BASIC.format(timeWithoutSeconds) == "T0830")
+        }
+
         @Test
         fun iso() {
             // Parsing and formatting LocalTime values using the ISO format

core/commonKotlin/src/LocalDateTime.kt

@@ -33,6 +33,7 @@ public actual constructor(public actual val date: LocalDate, public actual val t
 
     public actual object Formats {
         public actual val ISO: DateTimeFormat<LocalDateTime> = ISO_DATETIME
+        public actual val ISO_BASIC: DateTimeFormat<LocalDateTime> = ISO_DATETIME_BASIC
     }
 
     public actual constructor(year: Int, month: Int, day: Int, hour: Int, minute: Int, second: Int, nanosecond: Int) :

core/commonKotlin/src/LocalTime.kt

@@ -84,6 +84,7 @@ public actual class LocalTime actual constructor(
     }
 
     public actual object Formats {
+        public actual val ISO_BASIC: DateTimeFormat<LocalTime> get() = ISO_TIME_BASIC
         public actual val ISO: DateTimeFormat<LocalTime> get() = ISO_TIME
     }
 

core/jvm/src/LocalDateTimeJvm.kt

@@ -110,6 +110,7 @@ public actual class LocalDateTime internal constructor(
 
     public actual object Formats {
         public actual val ISO: DateTimeFormat<LocalDateTime> = ISO_DATETIME
+        public actual val ISO_BASIC: DateTimeFormat<LocalDateTime> = ISO_DATETIME_BASIC
     }
 
     private fun writeReplace(): Any = Ser(Ser.DATE_TIME_TAG, this)

core/jvm/src/LocalTimeJvm.kt

@@ -88,6 +88,7 @@ public actual class LocalTime internal constructor(
     }
 
     public actual object Formats {
+        public actual val ISO_BASIC: DateTimeFormat<LocalTime> get() = ISO_TIME_BASIC
         public actual val ISO: DateTimeFormat<LocalTime> get() = ISO_TIME
 
     }